JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <img>
    <p>
        <span>bar</span>
    </p>
</div>

JavaScript

var tracker = {};
Array.from(document.querySelectorAll("*")).forEach(node => {
    if (!tracker[node.tagName]) tracker[node.tagName] = 1;
    else tracker[node.tagName]++;
});
console.log(tracker);